Sidelink Group Setup With Conflict Avoidance for Low-Latency 5G
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Solution Overview
Problem
In wireless communication systems like 5G, direct communications between nearby user equipment (UEs) can consume excessive network resources and incur undesirable delays due to the need to traverse base stations, leading to inefficiencies.
Innovation Solution
UEs form groups for sidelink communications, utilizing conflict avoidance signals to manage resource allocation and prioritize transmissions, thereby reducing interference and optimizing spectrum usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE 1 and UE 2 continuously monitor PDCCH for DCI format 1_0 with RNTI SL-V-RNTI, then sidelink communication reliability is improved, but power consumption increases and latency is introduced when no data is transmitted
Solution Approach 1:
The patent applies preliminary action by configuring the UE with a pre-defined RNTI (SL-V-RNTI) and search space set (SL-V-RNTI-SearchSpace) before actual data transmission. This allows the UE to quickly decode DCI format 1_0 without extensive searching, reducing latency while maintaining reliability through pre-established monitoring parameters.
Solution Approach 2:
The patent implements dynamics by making the PDCCH monitoring behavior adaptive - the UE monitors PDCCH for DCI format 1_0 with SL-V-RNTI only when there is actual data to transmit or expect, rather than continuously. This dynamic adjustment reduces unnecessary monitoring latency and power consumption while maintaining reliability when needed.
2Reliability
If UE monitors PDCCH continuously for sidelink control information, then sidelink communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by configuring the UE to monitor PDCCH at specific periodic intervals rather than continuously. The monitoring is triggered by data transmission events, creating a periodic rather than continuous operation pattern. This reduces power consumption significantly while maintaining reliability by ensuring monitoring occurs at appropriate moments in the communication cycle.
3Adaptability or versatility
If multiple DCI formats are used for sidelink scheduling, then scheduling flexibility is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent implements universality by making DCI format 1_0 multi-functional - it can carry both uplink grant information and sidelink scheduling information using the same format structure. The UE uses the same RNTI (SL-V-RNTI) and search space configuration for both purposes. This reduces device complexity by eliminating the need for separate DCI formats and processing logic while maintaining scheduling flexibility through unified information delivery.
Data Source
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AI summary
Some aspects described herein relate to receiving, from a base station, a configuration to transmit uplink signaling to the base station, determining, based on the configuration, to setup a group for sidelink communication with one or more other user equipments (UEs), transmitting, based on determining to setup the group, a first uplink message based on the configuration from the base station, and receiving, from the one or more other UEs, a second uplink message based on the configuration to indicate setup of the group. Some aspects described herein also relate to conflict avoidance between sidelink and uplink/downlink communications.